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(a) SI = P×R×T/100
150 = 500×7.5×T/100
150 = 5×7.5×T
5×7.5×T = 150
T = 150/5×7.5
T = 150×10/5×75
T = 4 sec
(b) SI = P×R×T/100
78= 700×18×T/100
78 = 7×18×T
7×18×T = 78
T = 78/7×18
T = 0.619sec
T = 0.62 sec
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